| 摘要 |
PROBLEM TO BE SOLVED: To provide a dry vacuum pump with an improved purge fluid injection device. SOLUTION: The dry vacuum pump contains at least one stage in which a gas to be pumped circulates between a gas admission inlet and a gas discharge outlet, the stage containing a stator (19) for which a peripheral wall (23) is penetrated by two transmission shaft clearance holes (56, 57). The peripheral wall (23) contains a purging conduit (40) in part placed in the thickness of the peripheral wall (23) and for which an inlet (41) is located on an external face of the stator (19), and an outlet (43) emerges on a front face (49) equidistant from the two clearance holes (56, 57). Two guide slots (54, 55) arranged to look like an arched shape with a pointed head are extended starting from the outlet (43). COPYRIGHT: (C)2009,JPO&INPIT
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